Error Code P204A: What It Means & What To Do?

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The trouble code P204A can be defined as Reductant Pressure Sensor Circuit. It is the catalyst system which is responsible for reduction of all exhaust emissions although certain applications are also equipped with a NOx trap.

The reductant pressure sensor circuit is being monitored by the powertrain control module. This trouble code would be set by the PCM when the degree of voltage in the reductant pressure sensor circuit would not be as per the specifications set by the manufacturer. The engine control module, powertrain control module or the transmission control module monitors this circuit depending upon the particular automobile.

What causes this problem with the Reductant Pressure Sensor Circuit?

• Some flaws in the reductant pressure sensor
• Reductant pressure sensor harness might be opened or sometimes shorted
• Reductant pressure sensor circuit might have inadequate electrical connection

1. Automatic Transmission Module – Sometimes the automatic transmission module is unable to communicate or correctly anticipate the speed of the vehicle and thus creates difficulty in gear shift leading to sluggish acceleration, throttle response and stalling. Thus can also hamper a lot of components physically and thus must be check for and replaced, if required.
2. Engine Control Module - If there is any corrosion or breaks in the internal wiring of the harness, then it can cause a short in the ECM or can also cause corrosion in the ECM through the wiring harness. You can always rely on us as we have best auto parts for our customers.
3. Powertrain Control Module - The onboard computer, or powertrain control module is the brain of the engine control system. Now if the brain is not working properly, then neither is the car engine. Get it replaced before the situation gets worse.
4. Fuel Injector – The fuel injectors are important component of the fuel delivery system that helps in proper utilization of the fuel entering the engine. This not only helps in taking care of the air to fuel ratios in the engine, helping the combustion process but also enhances the performance. Thus, replace faulty injector now!
5. Exhaust Gas Recirculation Valve - It is auto part commonly found on many road going automobiles. It is a part of the vehicle’s exhaust gas recirculation (EGR) system, an emissions system that is designed to recirculate exhaust gases back into the vehicle’s intake so that it can reduce cylinder temperatures and NOx emissions. Purchase top notch exhaust gas recirculation valve from us at economical prices.
6. Electronic Control Unit - Is your car jump starting on reverse polarity? Or are you facing some intermittent starting issues? If yes, then it indicates that your electronic control unit is bad. So it is very important to replace the defective electronic control unit with us at equitable prices.
7. Diagnostic Tools - Buy quality diagnostic tools to check and diagnose OBD code P204A error with the help of experienced mechanic. Visit us today!

Our main motive is to achieve customer satisfaction as for us our customers are everything and that’s why we will help you to diagnose P204A code by mentioning some major symptoms below:

Common Symptoms

• The service engine soon light can start lighting up
• DPF regeneration might not occur

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P204A:

• You must fix the defective electronic control unit
• Make sure to mend the faulty reductant pressure sensor circuit
• It is essential to restore the flawed reductant pressure sensor
• Rehabilitate the defaults in the reductant pressure sensor harness
• Carefully adjust the faults in the PCM

However, if you face any issue then we have stocked a wide range of best priced def, pcm, reductant pressure sensor, pressure sensor signal, body control module component, fuel injection pump, pcm module, ecm module, electronic control module and more to help you out in fixing your car.

Here are some steps which you should follow in order to diagnose this fault code:

This is a general type of error code which is diagnosed with the help of a scanner. The mechanic will insert a scanner to diagnostic port of the vehicle and recover the codes and freeze frame data. If he happens to find any additional error codes, he has to address them as well. Once it is done, he has to reset the vehicle, and then test drive to see if the error code appears. If the error code does not return, then there can be an erratic condition. Then the mechanic has to check the wires, connectors and other electrical components and quickly replace them if he finds them to be damaged or defective. Then the vehicle should be taken out for a test-drive until the PCM either enters readiness mode or the code is reset. Now if the PCM enters readiness mode at this time, the code is intermittent and it would be very difficult to diagnose. If this is the situation, the conditions which contributed to the code being stored may need to worsen before a correct diagnosis can be made. If the code is immediately reset, the other step of your diagnosis would need that you search your automobile information source for diagnostic flow-charts, connector pin-out charts, connector face views, as well as constituent testing procedures/specifications.

Here is the Step 1

The DVOM should be used to test the reductant pressure sensor according to manufacturer specifications. Components which do not test within maximum allowable parameters should be considered faulty.

Here is the Step 2

If actual reductant system pressure is as per the specifications, the code P204A would exist, and the sensor is in working order, use the DVOM to test input and output signal circuits between the pressure sensor and the PCM/SC.

Common Mistakes When Diagnosing The P204A Code

• Non performance of the reductant pressure sensor
• Failure in the car wiring
• The powertrain control module might not function properly